TJ Rear Truss Upper Control Arm Mount Passenger Side 97-06 Wrangler TJ TNT Customs. This rear truss mount is CNC cut and precision formed to offer you a factory postion mount for your passenger's side control arm. Made of 3/16th sheet steel, this offers the ultimate in strength for your axle conversions. This mount will come welded to the truss when ordered at the same time as truss. You will need both driver's side and passenger's side mounts for your factory suspension set up.